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MELBOURNE, AUSTRALIA - JANUARY 19: Kei Nishikori of Japan plays a forehand in his third round match against Joao Sousa of Portugal during day six of the 2019 Australian Open at Melbourne Park on January 19, 2019 in Melbourne, Australia. (Photo by Julian Finney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 19:  Kei Nishikori of Japan plays a forehand in his third round match against Joao Sousa of Portugal during day six of the 2019 Australian Open at Melbourne Park on January 19, 2019 in Melbourne, Australia.  (Photo by Julian Finney/Getty Images)